CVE-2023-37836Public exploitNetwork attack vector

Encoder abort via unchecked bitmap input

Published Jul 13, 2023 · Updated Oct 30, 2024

Reachable assertion in libjpeg before 1.66 allows context-dependent attackers to abort the sample encoder with a crafted input file. BitMapHook in cmd/bitmaphook.cpp accepts short image reads without error, and the library ignores the hook's return value, letting inconsistent bounds reach a height assertion. The file must be processed by the bundled command-line encoder or a similarly exposed integration; Debian classifies the demonstrated crash as having no security impact.

CVSS severity6.5
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in libjpeg before 1.66 allows context-dependent attackers to abort the sample encoder with a crafted input file. BitMapHook in cmd/bitmaphook.cpp accepts short image reads without error, and the library ignores the hook's return value, letting inconsistent bounds reach a height assertion. The file must be processed by the bundled command-line encoder or a similarly exposed integration; Debian classifies the demonstrated crash as having no security impact.

The record

CVE
CVE-2023-37836
Published
Jul 13, 2023
Updated
Oct 30, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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